fix(tools): harden workspace file mutations

[PierrunoYT]

Summary

• route file write, edit, history, and undo operations through the opened workspace directory capability
• reject parent path components before any filesystem access
• remove the ambient absolute-path resolver and preserve confinement across missing paths and link/reparse-point traversal
• add regression tests proving junction/symlink escapes do not create or modify outside files

Validation

• cargo test --locked
• cargo build --locked
• git diff --check

Closes #13

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📥 Commits

Reviewing files that changed from the base of the PR and between 7ebe4f4 and 9fbdc37.

📒 Files selected for processing (6)

• src/tools/file_edit.rs
• src/tools/file_history.rs
• src/tools/file_undo.rs
• src/tools/file_write.rs
• src/tools/registry.rs
• src/tools/workspace.rs

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[euxaristia]

LGTM! Approved after audit.